signaller

noun

1. (UK)One who signals.
2. Synonym of signalman.

   “'We're recruiting an extra signaller for Nunthorpe, the only box [signal box] on the branch', says Chris Gee, Head of Operations - North at Network Rail in York. 'From December Nunthorpe will be staffed 24/7'.”

   “There was also public praise in the days that followed for the train's driver, Andrew Johnson. It took a cool head to co-ordinate with the signaller at York ROC to have the train switched from fast to slow line, to permit the stop in Huntingdon station.”